Earlier quoted context omitted.
> There would need to be (1) an existing valid contract, Your (1) is false. You can damage a business relationship that doesn’t involve a signed contract. “Tortious interference with business relationships occurs where the tortfeasor intentionally acts to prevent someone from successfully establishing or maintaining business relationships with others.” https://en.wikipedia.org/wiki/Tortious_interference
That's not a tort in American law. In this country contractual arrangement is required for tortious interference.
However that’s not strictly required: “Wrongful interference in a business relationship occurs when there is no contract. The defendant attempts to disrupt the relationship, causing economic harm. If the defendant defames the business owner’s product, resulting in loss of business, that is tortious interference in the business.”
https://www.findlaw.com/smallbusiness/liability-and-insuranc...